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    <meta charset="UTF-8">
    <title>使用 Bootstrap</title>
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    <h1>W3School Demo</h1>
    <p>Resize this responsive page!</p>
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      <h2>London</h2>
      <p>London is the capital city of England.</p>
      <p>It is the most populous city in the United Kingdom,
        with a metropolitan area of over 13 million inhabitants.</p>
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      <h2>Paris</h2>
      <p>Paris is the capital and most populous city of France.</p>
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      <h2>Tokyo</h2>
      <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
        and the most populous metropolitan area in the world.</p>
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